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What is the difference between AT and ATX power supply form factor?

April 26, 2017ATX Factor form power supply

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What is the difference between AT and ATX power supply form factor?

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A8: AT and ATX PSUs have different connector outputs with distinct output voltages. ATX has 20-pin connector for the motherboard while AT has two six-pin connectors. ATX carries +3.3V and +5Vsb, but AT PSU does not.